by University of Rhode Island. Extension Service

1911

by Ohio State University. College of Agriculture. Extension Service

1917

by University of Rhode Island. Extension Service

1912

by Iowa State University. Cooperative Extension Service

1930

by Ohio State University. Cooperative Extension Service

1921

by South Dakota State University. Cooperative Extension Service

1926

by Mississippi State University. Cooperative Extension Service

1919

by University of Georgia. Agricultural Extension Service

1928

by University of California Agricultural Extension Service

1921

by University of Tennessee (Knoxville campus). Department of Agricultural Education

1921

by Tennessee. University. Agricultural Extension Service

1917

by University of Massachusetts (Amherst campus). Cooperative Extension Service

1912